Malicious PDF — malware analysis report

Static analysis result for SHA-256 b715dda834c3fe3c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 12:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c2d269e6eec2648468ce3e4d1776a093 SHA-1: d5b3d08afc6dccd6d15086970a02f57a61e5afeb SHA-256: b715dda834c3fe3c6570ab02d3a74b2f1168a081da3b64f23656b65fbf99c7e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/8daccd5b3273c748024136b840caff9d/3626143442.pdf In PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5a1b1aae3485330047e20ed477f5b604/8408256255.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/96879519682.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160966c432cb83---lekifezuzuvuzetejap.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608707fcb809a---58424912723.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9edcca8f02753d3907bd47d125bc8bbd/nuwulo.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/lopixo.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/kipuvuguzifogube.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/3738075382.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d60c6a680e6f3eb707bf88af4fef53c1/magazomuvewafarate.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/lipijug.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/nufigipuv.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/7qdrulumilf8obp5aaf8koo4p3/xaxawowigowir.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/83617075983.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/98432422871.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/f488f10e03af0b320acf7c603d09a665/rowavilin.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/88456041915.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/sasawajudejidopozajav.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071db3e1000e---pesotif.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d4492f5942a---gobatewebirazovad.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/30101063677.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e25befe5---dajurezuvugavuzevazuguw.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/9e217f3615dc4cc4d31a30e7a7bd023b/86742600111.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/zegobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=animals+and+their+young+ones+worksheets+for+grade+2PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD592 17396 bytes
SHA-256: 139b5a69f1047c0aa6b09b9f2518087656c7f39323c8acec19b8d7889671f47e
font_01_sfnt_off000102cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CC 11296 bytes
SHA-256: 8b3bdcb3fa90f8899582ee566c8e122178a8996e94584c550d316ebc13fb807e
font_02_sfnt_off00011d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1